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Articles by Stephen Hamstra P.E., ASHRAE HBDP LEED AP,

Pumping and Flow Controls in Geothermal Heat Pump Systems

November 9, 2012
What are the key technical challenges and design options for optimizing a geothermal heat pump design? Review the pros and cons involved with centralized or distributed pumping, with hybrid or decoupled systems, and with the controls that can guide them.
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Large Scale Geothermal Heat Pump Systems

September 6, 2011
With the help of advances in intelligent controls and a shift in design mindset, these systems can steer buildings toward smaller equipment sizes and associated savings. Review three projects and consider the benefits of keeping an upcoming project in the loop.
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"V" is for Ventilation

March 1, 2010
And “M” is for “More than one way to get the job done.” In this two-school tour, we start with an underfloor ventilation design and geothermal energy center in action. Then we take notes at a school with displacement ventilation, radiant floor heating, and radiant ceiling cooling. Round out the lesson with discussion of ASHRAE 62.1-2007 guidelines and the Wells-Riley equation for infection and ventilation, and your next school project is practically getting smarter already.
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3/25/14 2:00 pm EST

Improving Cooling and PUE in Existing Data Centers

On-Demand This webinar will provide cost-effective practical tips and feasible retrofit solutions that can be implemented in operational data centers to address some cooling issues and improve energy efficiency.

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Engineered Systems Magazine

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2014 April

Check out the April 2014 issue of Engineered Systems, with features on backup power supply requirements, cyberattacks, and much more!

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Design Flaws

Following up on Howard McKew's April "Tomorrow's Environment" column: Have you ever thought twice about reporting problems with another firm's design? What did you do?
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THE ENGINEERED SYSTEMS STORE

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The Green Energy Management Book

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Tomorrow's Environment Podcast

This series from longtime columnist and chronic forward-thinker Howard McKew covers a lot of ground -- from retrocommissioning to systems training, on toward checklists for drawings and tips for meeting minutes. Click HERE to be taken to the podcast page!

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